Burger Tuning N55 Stage 1 Tune?

Hi,
I'm planning to do a tune for my 2011 N55 X6 35i,

is Burger Tuning N55 Stage 1 Tune really effective?

Has anyone tried it?
http://ift.tt/1fgsT6B

Also, is there a way to remove the governor speed limiter?

Thanks

Burger Tuning N55 Stage 1 Tune?